X射线非完整扫描情况下的缺陷检测研究  

Research on Defect Detection from Incomplete Scanning of X-ray

作　　者：张顺利[1,2] 张定华[2] 程云勇[2] 李小林[1] 

机构地区：[1]咸阳师范学院图形图像处理研究所,咸阳712000 [2]西北工业大学现代设计与集成制造技术教育部重点实验室,西安710072

出　　处：《核电子学与探测技术》2011年第3期359-363,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(50375126);陕西省自然科学基金(2009JQ8017);咸阳师范学院专项科研基金项目(10XSYK102;07XSYK214)

摘　　要：CT技术是一种先进的无损检测手段,被广泛应用于医学和工业领域。针对大型工业构件的无损检测问题,提出了一种X射线非完整扫描情况下的缺陷检测方法。在构件使用之前预先采集一套原始的非完整扫描投影数据,采用代数重建算法进行图像重建,将重建图像作为基准图像。再采集构件使用之后不同时刻的非完整扫描投影数据,将其重建图像与基准图像进行数字减影,通过减影图像即可清晰、直观地检测出缺陷。实验结果证明了该方法的有效性。Computed tomography（CT）is an advanced means of non-destructive testing,which has been widely used in medical and industrial fields.Aiming at the non-destructive testing problem of large industrial components, It presents a defect detection method from incomplete scanning of X-ray.Firstly,a set of incomplete scanning projection data before using the component has been obtained,then reconstruct them by algebraic reconstruction technique（ART）,and take the reconstructed images as the norm images.Then,the incomplete projection data of different times during the use of the component has been obtained,and reconstruct them by ART algorithm.Finally,It makes digital subtraction operation by the reconstructed images and the norm images, the defection can be detected clearly and intuitively from the subtraction image.Experimental result shows the proposed method is effective.

关 键 词：工业CT 图像重建 代数重建法 数字减影 缺陷检测 

分 类 号：TP391.75[自动化与计算机技术—计算机应用技术]